Here's the way I look at it...
If you're already going through all the work of hoses, evap, conden, you need a new dryer, etc etc...
Pull the pump off, drain it, flush it, refill with fresh ester, drain it, then refill again, add dye, and just be done with it.
From my experience, it's just not worth the BS of doing it over and over again.
I hooked a bolt to my impact and ran the pump with fresh oil a few times. I don't see why you can't test compression with a good enough (amps) drill. But the only real way to find out is with correct RPMs and charged.
If you replace the evap, just don't forget that shrader valve!!! LOL
1977 Jeep Cherokee Chief
360 w/ MC 4350
All stock but ignition and slightly modified suspection
Original paint, garaged/non-op for over 15 years